Head Coach Lyn Jones has named a 26 man squad in preparation for Saturday's EDF Energy Cup Semi-Final against Saracens at the Millennium Stadium (KO 5.15pm).
13 of the Ospreys 14 Grand Slam winners are named in the preliminary squad, with just second row Ian Gough missing out after playing an integral role in the Welsh forward efforts over the last six weeks.
Lyn Jones said: " Ian Gough has had a particularly heavy affair over the last six weeks or so, so it's in the best interests of Ian and the Ospreys that we give him a week off to recuperate and come back a bit stronger and to be at his best."
Ospreys squad: L. Byrne, N. Walker, S. Williams, J. Vaughton, A.
Bishop, S. Parker G. Henson, D. Biggar, J. Spratt, J Hook, M.
Phillips, J. Marshall, D. Jones, P. James, A. Jones, C. Griffiths, R.
Hibbard, H. Bennett, L. Bateman, A. W. Jones, I. Evans, R. Jones, J.
Thomas, F. Tiatia, T. Smith, M. Holah
The final 22 will be named on Friday at midday.